Here's a list I compiled and posted a couple of times. The Old Oyster Factory would be my first thought but a number on the list would likely do. Redfish also might fit though I haven't been there personally.
Fine Dining
Old Fort Pub
Sunset Grill
Fitzgerald's
Charlie's (french something)
Alexander's
Charleston's
Santa Fe
Captain's table
Cafe Europa
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Pizza
Dunes
Guisseppi's
[/list=1] Both right close by DVC
Fun/Family
Old Bamboo
Old Oyster Factory
Truffle's
Wild Wings
Hafbrauhouse (? sp)
Crazy Crab, especially at Harbour Town
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I'd avoid CQ's and Charlie's Crab.
Others to consider that I don't know much about are:
HH and Blufton Diner
Alligator Grill
Abe's Shrimp House
South Beach Cafe (? name)
Scott's
Kingfisher's (recommended for seafood by a friend and right by DVC)
La Pola (in with Kingfisher's)
Quarter Deck
Harbor Masters
Westin Seafood Buffet
Cafe at Wexford
Tony Roma's (how different can it be)
Hudson's (near Old Ft Pub, my partner really liked it)
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Discounts, DVC has a discount list, just use your room key or member card. Many of these above have early bird specials. There is a Restaurant Guide that has menus as well as a list of early birds, etc. For seafood, Old Oyster Factory is a must but doesn't take reservations. There are coupons in the books for free salads and they let me use the free salad as well as DVC 10% off both. If you at all like wings, Wild Wings is a must, I think they have 23 flavors of Wings. Best steak was Fitzgerald's. Old Bamboo is like World War II or MASH, good food also. Best Views were South Beach Cafe, Cafe Europa, Quarterdeck, Old Ft Pub, Sunset Grill (so I'm told) and maybes Harbormasters and Kingfishers. Best Value likely Old Bamboo, Wings, Old Oyster Factory, Dunes Pizza. Some of these are in Sea Pines and there is a $5 fee per day.
Your welcome. We own 3 Marriott weeks there though a large part of the credit must be given to others, particularly to Marty Echols who provided recommendations to myself and others over the past few years. I've always found his recommendations to be on target.